c++ - access overloaded template functions -

hey guys, i'm confused how access overloaded template function one:

 template <typename t>  friend istream& operator>> (istream& in, matrix& right)  {       for(int i=0; i<right.rows*right.cols; i++)         cin >> right.elements[i];  } 

with function such as:

 template <typename t>  matrix(t r, t c) {rows=r; cols=c; elements=new t[r*c];} 

i able

 matrix <double> test(number, number)  

for example, have no idea how use templated >> operator (or << or * or +..) appreciated. thanks!

i assuming declaring class template matrix has type argument t, , want use defined operator>> (you should make more explicit in question):

template <typename t> class matrix {    int rows, cols;    t* elements; public:    matrix( int c, int r );        // want number of                                    // rows/columns of type `t`??     // note: removed template, want befriend (and define)    // single operator<< takes matrix<t> (the <t> optional    // inside class braces    friend std::istream& operator>>( std::istream& i, matrix& m )    {        // m.rows, m.cols , m.elements accessible here.        return i;    } }; 

and quite simple use:

matrix<double> m( 1, 2 ); std::cin >> m;  

that not option, common one. in general class template can befriend single (non-templated) function (think operator<< , operator>> functions) in code above, or might want befriend function template (all instantiations) or particular instantiation of function template.

i wrote long explanation of different options , behaviors here, , recommend read it.